CVE-2021-41109 LiveQuery publishes user session tokens
Parse Server leaks user session tokens in LiveQuery payloads, allowing attackers to hijack accounts if users subscribe to the User class.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-41109?
CVE-2021-41109 is a high-severity vulnerability in Parseplatform Parse-Server, published on 30 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to version 4.10.4, for regular (non-LiveQuery) queries, the session token is removed from the response, but for LiveQuery payloads it is currently not. If a user has a LiveQuery subscription on the `Parse.User` class, all session tokens created during user sign-ups will be broadcast as part of the LiveQuery payload. A patch in version 4.10.4 removes session tokens from the LiveQuery payload. As a workaround, set `user.acl(new Parse.ACL())` in a beforeSave trigger to make the user private already on sign-up.
Weakness: CWE-200
Which versions are affected by CVE-2021-41109?
3 open source packages ship an affected version, including parse-server and parse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
parse-server npm | All versions | 4.10.4 |
parse-server npm | All versions | 4.10.4 |
parse Bitnami | All versions | 4.10.4 |
Products include Parseplatform Parse-Server.
How do I fix CVE-2021-41109?
Upgrade parse-server to 4.10.4 or later.
Is CVE-2021-41109 being exploited?
There is no known exploitation of CVE-2021-41109 in the wild and no public exploit code.
Other vulnerabilities in Parseplatform Parse-Server
- CVE-2026-30966 Parse Server role escalation and CLP bypass via direct `_Join` table write
- CVE-2024-27298 Parse Server literalizeRegexPart SQL Injection
- CVE-2022-24760 Command Injection in Parse server
- CVE-2026-30965 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
- CVE-2023-36475 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution
Sources
Also known as BIT-parse-2021-41109, GHSA-7pr3-p5fm-8r9x.